If sights are vertical, then
- AEye vane and object vane will be in same line
- BEye vane, object vane and string will be parallel and in same lineCorrect
- CThere will be no local attraction
- DNone of the above
Solution
Concept
Alignment of the sight vanes
Step-by-step solution
1. For a correct line of sight, the eye vane, the object vane and the object (string or hair) must all lie in one vertical plane. 2. So these elements are parallel and in the same line.
Explanation
When the sights (vanes) of a compass are vertical and properly set, the slit of the eye vane, the hair of the object vane and the string or object sighted all lie in the same vertical plane.
Shortcut
Sights vertical → eye vane, object vane and object in one line.
Correct answer: B) Eye vane, object vane and string will be parallel and in same line